Brass Military Button

[jojo82]

Can anyone give me any information on this Military button like object. I believe it's made out of brass and has the initials N.A. US on the front and on the back the piece unscrews. Thank you for any information.

 

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[nhbenz]

Welcome to TreasureNet!
WWI National Army collar disc, as can be seen here: http://hglanham.tripod.com/metalinsignia/collardisk1.html
Note they can be specifically dated to 1917-18.

 

[jojo82]

Thank you so very much for the information. I believed it belonged to my Granfather who served in WWI.